Answers

2014-02-11T21:17:54+01:00
The formula is (n - 2) X 180
n is number of sides so 
a. 11 - 2 X 180 
9 x 180 = 1620

b. 12 -2x180
10 x 180
1800

c. 14-2x180
12 x 180 
2169

d. 15-2x180
13x180
2340

e. 20-2x180
18x180
3240

1 5 1